available at http://www.ncbi.nlm.nih.gov/pubmed/25471318 Editorial Comment: In this interesting study the duration of erection leading to successful sexual intercourse was evaluated. Following the initial screening patients entered a 4-week treatment-free run-in phase and an 8-week treatment period during which they were instructed to attempt intercourse at least 4 times on 4 separate days. A total of 95 men were enrolled at 10 centers. After an 8-week treatment course the duration of erection leading to successful intercourse was 9.39 minutes. There were significant benefits with vardenafil in all domains of the International Index of Erectile Function. Secondary efficacy end points, including success rate of penetration, maintaining erection, ejaculation and satisfaction, were superior when patients were treated with vardenafil. These data provide guidance to the clinician and patient regarding the duration of an erection using vardenfil.